<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <div id="app"></div>

  <template id="my-app">
    <div>{{msg}}</div>
    <div v-html="msg"></div>
  </template>

  <script src="../js/vue.js"></script>
  <script>
    const App = {
      template: '#my-app',
      data() {
        return {
          msg: '<span style="color:red; background: blue;">哈哈哈</span>'
        }
      }
    }

    Vue.createApp(App).mount('#app');
  </script>
</body>
</html>